In 1907, James Spangler came up with the idea of using a portable electric vacuum cleaner while working as a janitor for an Ohio department store. The concept came to him because the carpet sweeper he used on the job aggravated his asthma.
It was in the 1930s that H.H. Schultz and J.Q. Sherman received a patent that permitted the company to install window air conditioning units for residential use.
Dishwashers, which typically last for nine years, can have a life span of up to 13 years with proper care and maintenance.
Percy Spencer, an American engineer of the industrial corporation Raytheon, invented the microwave oven by accident in the 1940s.The unexpected discovery came when, one day, Spencer had been working close to magnetrons, which generate microwaves.